/Engine/Source/Runtime/Experimental/Iris/Core/Public/Iris/Serialization/NetBitStreamWriter.h
Discards a substream of this stream. This stream's bit position will remain intact. The buffer may be modified anyway as mentioned in CreateSubStream().
void DiscardSubstream ( [FNetBitStreamWriter](API\Runtime\IrisCore\Iris\Serialization\FNetBitStreamWriter) & Substream )